Fruit, Nut & Berry Fuel | 20-6-9 | Slow–Release 90 days This formula helps to build strong, healthy plants and trees which can then provide exceptional yields. The slow–release formula gives steady nutrition over a 90-day period. Reapply every 90 days during the growing season. This fertilizer comes in a 2-pound resealable bag. Have only a small number of plants to fertilize? Check out our 14-ounce bag.